Another way to look at it. Google "Power Services fuel treatment" and have a look at their home page. You aren't going to tell me that a company of that size, with the beginnings it had, longevity and growth since 1956 are going to mfgr. "snake oil" or something that will harm your injector pump or other parts of your engine in today's law suit crazy economy with all the 100's of thousands of diesels working worldwide, especially with all the SATISFIED customers like me that keep them in business.
Just because someone is in business or a dealer of something and all that doesn't mean they know it all. I have had a lot of interactions with retailers/repair facilities, mechanics, sales folks, clerks, and all, and asked some pointed, specific, questions about certain things and got answers from A to Z. I especially dislike it when someone supposedly in the know attempts to blow smoke.......when I know full well more about the subject than they do and easily recognize their incompetence.
Same can be said for the Stihl dealer in another thread I read earlier today on this forum saying not to believe in Stihl chain saw oil and self contained fuel treatment. Some people are just stupid. Some people just work for the check. Some people don't give a hoot about what they are doing. Some people go off half cocked with an idea without thoroughly thinking through it with competent reasoning. Some people don't bother learning their business..............